Magnetic separator.



PATENTED JUNE 20, 1905.

E. C. KAVANAUGH.

MAGNETIC SEPARATOR.

JexPPLIoMIoN FILED APR.15,1904.

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O O 0 U O B 0 G o E 0 O O O O 0 No. 792,776. PATENTED JUNE 20, 1905. E. c. KAVANAUGH.

MAGNETIC SEPARATOR.

APPLIOATION FILED APR.15.1904.

3 SHEETS-SHEET 2.

PATENTED JUNE 20, 1905.

E. G. KAVANAUGH.

MAGNETIC SBPARATOR.

APPLICATION FILED 1111.15.1904.

3 SHEETS-SHEET 3.

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ww Mm mw IIIi/ UNITED STATES Patented June 20, 1905.

PATENT OFFICE.

MAGNETIC sEPAnAToR.

SPECIFICATION forming partV of Letters Patent No. 792,776, dated June 20, 1905.

Application filed April l5, 1904. Serial No. 203,321.

To all whom, it may concern:

Be it known that I, ELWIN C. KAVANAUGH, a citizen of the United States of America, and a resident of Holyoke, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Magnetic Separators, of which the following is a full, clear, and exact description.

This invention relates to improvements in magnetic separators of the kind employed in vats or tanks for paper-pulp and for serving to draw into the magnet-cylinder thereof the particles of iron or magnetic metal, whereby such particles are prevented from being carried to the paper-making machine to become incorporated into the web, with the effect'of spoiling more or less of the paper made in the machine.

The object of the invention is to construct a magnet-cylinder in a manner to exclude the entrance of water thereinto, which, as known, is very harmful, for the reason that it greatly increases the liability of the burning out of the windings of the magnet-cores or polepieces.

Another object is to improve the construction ofthe magnet-cylinder,whereby the windings for any of the pole-pieces may be renewed as occasion may require conveniently and without entirely discarding the cylinder.

Another object of the invention is to provide improved means for the clearing away from the surface of the magnet-cylinder of the magnetic particles attracted thereto; and a further object is to generally organize the machine for convenience of assemblage and repairs and for an unusually high degree of efciency.

The invention consists in combinations and arrangements of parts and the constructions of certain of the parts, all substantially as hereinafter fully described, and set forth in the claims.

The improved machine is illustrated in the accompanying drawings, in which-- Figure 1 is substantially a sectional view as taken vertically and longitudinally through the machine. Fig. 2 is a cross-section as taken on the line 2 2, Fig. 1. Fig. 3 is a cross-sectional view of the magnet-cylinder as taken at the plane indicated by the line 3 3, Fig. 1. Fig. 4 is a perspective view showing one of the core-bars or pole-pieces and the magnetcoil therefor detached therefrom. Fig. 5 is a central longitudinal view through one end portion of the magnetic cylinder and showing appliances thereunto appertaining.

Similar characters of reference indicate corresponding parts in all of the views.

1n the drawings, A represents a tank, vat, or flow-box of suitable form and dimension, having suitable journal-supports at opposite sides thereof for the gudgeons of the magnetic cylinder B, one of the gudgeons having a driving-pulley B2 thereon to be driven by a belt.

The magnetic cylinder as it has been constructed with practicability comprises a central bar or shaft a, cross-sectionally square and having end sockets b, receiving therein studs or hub-like inner projections 0l of the end heads e, which have the outward axiallyextended gudgeons or journal extensions f, the said central shaft or bar c supporting the magnet-cores or pole-pieces g g, which are surrounded by the magnet-coils i and the outer cylindrical shell c'.

The central shaft or bar c is constructed with squared longitudinal grooves 10,as shown in Fig. 2, in which are engaged the inner end portions of the magnet pole-pieces g, which latter have sectorshaped end flanges g2 at their outer edges, which preferably extend throughout the whole length of the cylinder between the heads thereof, the sector-provided pole-pieces' being secured to the central shaft or bar a by the radially-applied screws 12, the inner extremities 'thereof threading into the central bar a. The magnet-coils la, are wound about a shell 13 of fiber or other suitable insulating material, which is fitted around the core-bar g, and the coils or winding-wire for the pole-pieces extending from the one to the other have their terminals 15 15 carried through the tubular journal f at one end of the cylinder and outwardly to connection with the commutator-rin gs m m, which are insulated from each other and on which the brushes n have contact, the brushes being by the Wires 0 connected with the line or feed wire and the return-wire.

The end heads are formed with rabbets, as indicated at 16, so that when the outer cylindrical shell is drawn on to surround the polepieces there is ai each end ofthe cylinder an annular grooven which solder may be introduced, as indicated at 17,'for holding the shell in place and hermetically inclosing the magnet-cylinder.

As shown in Fig. 5, the connections of the magnet-coil-wire terminals with the commutator-rings through the hollow journal f, and so that there can be no leakage into or out from the hollow journal, are made by means of appliances, as follows: Surrounding and affixed on the one end and hollow journal f of the cylinder is asleeve 18 of fiber or insulating material,having opposite stepped-down cylindrical ends, about which the commutator-rings are fitted, and the intermediate cylindrical portion 19 of the sleeve 18 has diametrically opposite sockets or circular holes 20, which register with openings 21 through the tubular journal f. The wires extending through the tubular journal are bent outwardly to extend through the openings 21 and partially7 through the holes 20 and are bent more or less nearly at right angles and extended in opposite directions parallel with the axis of the hollow journal and are entered with a tight lit into perforations therefor within the thickness of the commutator-rings. The inner portions of the holes 21 are formed beveled, makingv a seat for a washer 22, of l ing held in place by tubular screw-plugs 25,

and the hole 20 is lled, as indicated at 26, with sulfur or any composition not affected by oil or water. The commutator and brush are inclosed within a housing, as indicated at C, the hollow journal extending beyond lthe commutator therebeyond and to the exterior of the housing, and the passage through the one end journal f, which extends entirely through the length thereof, has connected therewith ahorizontal limb 19 of pipe connections between the hollow journal and the tank D, understood as supported in a fixed position and to contain a body of oil rr, the level of the top of which is more or less above the top of the vacant space within the magnet-cylinder. The horizontal limb 7) extends through a gland-coupling 28 and stufling-box 29, and in the conduit-section between the said limb p and the expansion-tank D are two shut-off cocks g and r.

With the parts set up as represented in Fig. 1 the space in the magnetic cylinder not occupied by the pole-pieces and magnet-coils comtion through the oil-filled hollow journal j, with the body of oil in the expansion-tank D, there can be no liability of entrance of water or moisture into the magnetic cylinder from the flow-box or pulp-vat, and no matter what the temperature of the magnetic cylinder may be, whether it be considerably heated by the current operating at different timesunder different electrical conditions, thereV can be no bursting or straining of the cylinder by at times the Very material expansion of the oil, for the expansion-tank D accommodates all increased bulk of the oil and insures on a diminishing of such bulk on a lowered temperature within the magnet-cylinder that the latter will still remain completely oil-filled.

30 represents a fiange alixed on the cylin der-journal f adjacent the housing and acting as a guard to 'prevent water or pulp which may slop over from the flow-box from finding its way within the housing to impair the electrical appliances which are therewithin.

Now in case after more or less protracted use of the magnetic separator the same may be burned out as regards some one of its magnet coils it is therefore only necessary on dismantling the cylinder and without discarding it as a whole to remove the solder 17, draw off the outer shell z', detach the pole-piece the winding of which is burned out or impaired, remove the defective Winding, and rewind and replace the parts as originally set up, it being entirely practicable to splice or connect the end portions of the winding-wire for the magnet-coil as occasion may require.

Supported with its edge in scraping contact against the magnetic cylinder is a "doctor F, (represented in cross-section in Fig. 2,) the same having a trough-shaped portion 33, which is inclined from end to end, so that the accumulations of magnetic particles taken up by the cylinder with Inoisture and perhaps with small quantities of pulp will find their way into the channel 33 of the doctor and flowing to the end thereof will be discharged into a receptacle 34, for which is provided a discharge-pipe 35, and in addition to the troughshaped doctor F a further clearing device for the magnetic particles may be provided, as represented in Figs. 1 and 2, which consists of a plurality of Scrapers s s, which are carried at intervals by :an endless chain t, the edges of the Scrapers being concaved, as represented at 36, to conform to the contour of the cylinder. rl`he endless sprocket-chain t is arranged to have its upper and lower courses run horizontally, and it is supported by and between two sprocket-Wheels u a, one of which is on a shaft o), having another sprocket-wheel w, around which runs a sprocket-chain 102, which encircles a sprocket-wheel at w3, which is on a suitable shaft therefor provided with a bevel-pinion y, which meshes into a bevel gear-wheel .e on the journal j' for the cylinder IOO IIO

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.which is adjacent the driving-pulley, and

' wardly from the expansion-tank D, as indicated in Fig. 5, are made in sections coupled together at 47,' a cock Q or o" being comprised in each of' the sections 45 and 46, respectively, so that by uneoupling the sections 45 and 46 and closing both ofthe cocks the oily from both the expansion-tank and the cylinder may be held therein, and when the magnetic cylinder is removed to be opened up for repair or replacement the oil therein contained'may at a proper time be drawn off through the end conduit by opening the cock fr and saved.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a magnetic separator, aninclosed magnetic cylinder rotatably mounted in apulp receptacle, or conduit, having pole-pieces and magnet-coils therein, and having a hollow endwise-extending journal, combined with a receptacle connected with the hollow journal, and a quantity of oil in part contained in said receptacle and filling the space within the magnetic cylinder.

2. In a magnetic separator, an inclosed magnetic cylinder rotatably mounted in a receptacle or conduit for pulp, having pole-pieces and magnet-coils therein, and having the space within such cylinder which is unoccupied by the such electrical equipments filled with oil, said cylinder being provided with an endwiseextended hollow journal, an oilreceptacle pipe connected with said journal and means for opening and closing the passage therethrough for the entrance or withdrawal ofthe oil into or from the cylinder.

3. In a magnetic separator, an inclosed magnetic cylinder rotatably mounted in a pulp receptacle, or conduit, having pole-pieces and magnet-coils therein,and having ahollow endwise-extending journal combined with a receptacle, located higher than the top of' the cylieder-chamber, and pipe-connected with said hollow journal, and a quantity of` oil contained in said receptacle and filling the space within the cylinder.

4. In a magnetic separator, an inclosed magnetic cylinder rotatably mounted in a pulpreceptacle, or conduit, having pole-pieces and magnet-coils therein,and having a hollow endwise-extendingjournal,combined with a receptacle and a pipe composed of separable and coupled sections, connected with the said receptacle and with the said hollow journal, a cock in each separable pipe-section, anda quantity of' oil in said receptacle and filling the space within the magnetic cylinder.

5l In a magnetic separator. an inclosed magnetic cylinder rotatably mounted in a pulp receptacle, or conduit, having pole-pieces and magnet-coils therein, and having ahollow endwise-extending journal having at its extremity a stuffing-box, combined with a suitably-elevated oil-receptacle having a depending conduit provided with a horizontal limb entered within the extremity of the hollow journal through the stuffing-box thereat, and comrdnunicating with the spaces within the cylin- 6. In a magnetic separator, an inclosed magnetic cylinder rotatably mounted in a pulp receptacle, or conduit, having pole-pieces and magnet-coils therein, and having a hollow endwise-extending journal, combined with an oilreceptacle connected with the hollow journal, and communicating with the spaces within the magnetic cylinder, a commutator encircling and rotatably carried by said hollow journal, the terminals of the magnet-coils being extended through the said hollow cylinder-journal to connection with the commutator.

7 In a magnetic separator, an inclosed magnetic cylinder rotatably mounted in a pulp receptacle, or conduit, having pole-pieces and magnet-coils therein, and having a tubular endwise outwardly-extending journal, combined with a suitably-elevated oil-receptacle, pipe-connected with said hollow journal, and communicating with the spaces within the cylinder, a sleeve-like part composed of insulating material fitted about the said hollow journal and having the separated metallic commutator-rings thereon and provided with radial openings in line with openings which are formed radially through the hollow journal, the terminals of the magnet-coils being extended through the hollow journal and through the radial openings in the latter and in said part of insulating material, and extending to connection with the commutator-rings, and packing in said radial openings for preventing the outflow of oil therethrough.

8. In a magnetic separator, an inclosed magnetic cylinder rotatably mounted in a pulp receptacle or conduit, having pole-pieces and magnet-coils therein, and having a tubular endwise outwardly-extending journal, combined with a suitably-elevated oil-receptacle, pipe-connected with said hollow journal, and communicating with the spaces within the cylinder, a sleeve-like part composed of insulating material fitted about the said hollow journal and having the separated metallic commutator-rings thereon and provided with ra- TOO lIO

dial openings in line with openings which are formed radially through the hollow journal, the terminals of the magnet-coils being eX- tended through the hollow journal and through the radial openings in the latter and in said part of insulating' material and extending to connection with the commutatorrings and packing means in said radial openings for preventing the outflow of oil therethrough consisting of alternate layers of fiber and asbestos, in the journal-openings and a tubular screwplug, and a suitable composition unaffected by water or oil in the outwardly-opening portions of said radial cavities, substantially as described and shown.

9. In a magnetic separator, a magnet-cylinder comprising in combination, a central bar having longitudinal channels along different sides, and having end sockets, pole-pieces in form of bars inwardly edgewise engaged in said channels, means for detachably fastening the pole-piece bars in their places, end heads having inwardly-projecting studs or hubs cngaging in said soclrets,.and having outwardlyextending journals, and the cylindrical metallic shell fitted over and inclosing the structure.

10. In a magnetic separator, a magnet-cylinder comprising in combination, acentral bar having longitudinal channels along different sides, and having end sockets, pole-pieces in form of bars inwardly edgewise engaged 1n said channels, and provided at their outer portions with sector-shaped members, screws eX- v sages leading into the spaces within the cylinder, pole-pieces and magnet-coils within the cylinder, and an oil-receptacle having cornmunication with the said hollow journal and serving to keep the space within the cylinder completely filled with oil.

Signed by me at Springlield, Massachusetts, in presence of two subscribing witnesses.

ELVIN C. KAVANAUGH.

Witnesses:

A. V. LEAHY, WM. S. BnLLows. 

